Volt
power source

ABSTRACT

FOLLOWING IS DISCLOSED AN AUTOMOTIVE VEHICLE WASH SYSTEM HAVING SEPARATE RINSE AND WASH WATER CIRCULATION LOOPS. CONTROL VALVES DISPOSED IN LINES CONNECTED WITH THE RINSE AND WASH WATER CIRCULATION LOOPS PROVIDE ESSENTIAL INSTANTANEOUS CHANGE FROM RINSE TO WASH WATER AT EACH CAR WASH LOCATION. PARALLEL ELECTRICAL CONTROLS ENABLE EACH CAR WASH STALL OR LOCATION TO ENERGIZE COMMON WASH OR RINSE WATER PRIMARY MOTORS, WHILE PREVENTING INTERFERENCE BETWEEN THE WASH AND RINSE WATER SOLENOID CONTROL VALVES USED AT EACH LOCATION. A CONDUCTIVITY SENSING ELEMENT IN A WASH WATER STORAGE TANK CONTROLS A SOLENOID VALVE TO INTERMITTENTLY ADD WATER TO CONTROL CLEANING COMPOUND CONCENTRATION.

Feb. 9, 1971 H. L, NULL Re. 27,049

AUTOMOTIVE VEHICLE WASH SYSTEMS Original Filed May 27, 1966 2Sheets-Sheet 1 INVENTOR ATTORNEYS Feb. 9, 1971 Original Filed Mav 27,

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ATTORNEYS United States Patent Oice Re. 27,049 Reissued Feb. 9, 197127,049 AUTOMOTIVE VEHICLE WASH SYSTEMS H. L. Null, 4004 Golden OaksDrive, Fort Worth, Tex. 76117 Original No. 3,389,860, dated June 25,1968, Ser. No.

553,392, May 27, 1966. Application for reissue Dec.

24, 1968, Ser. No. 799,135

Int. Cl. Bb 9/00 U.S. Cl. 239-124 4 Claims Matter enclosed in heavybrackets appears in the original patent but forms no part of thisreissue specification; matter printed in italics indicates the additionsmade by reissue.

ABSTRACT 0F THE DISCLOSURE Following is disclosed an automotive vehiclewash system having separate rinse and wash water circulation loops.Control valves disposed in lines connected with the rinse and wash watercirculation loops provide essential instantaneous change from rinse toWash water at each car Wash location. Parallel electrical controlsenable each car wash stall or location to energize common wash or rinsewater primary motors, while preventing interference between the wash andrinse water solenoid control valves used at each location. Aconductivity sensing element in a wash water storage tank controls asolenoid valve to intermittently add water to control cleaning compoundconcentration.

My invention relates in general to systems utilized in washingautomotive vehicles, especially automobiles, and in particular toimproved systems which provide wash water and rinse water at selectedwash locations or stalls in an improved manner.

Previously, car wash systems have been developed in which a wash watercontaining a soap or detergent and rinse water are pumped throughconduits to movable spray nozzles located in a number of usuallyparallel car Wash stalls. Preferably a coin-operated meter is used ateach car wash location, and control means provided so that wash waterand rinse water may ibe supplied to each spray nozzle in quantitiescontrolled by the person wash` ing his car.

The most common prior car wash system had a pump for each car washstall, and wash and rinse water was pumped through relatively longconduits to each stall. In

instances where each car Wash stall had a single conduit thattransmitted both wash and rinse water from the equipment room, there wasa significantly long delay between the instant the control switch wasmoved between the rinse water and the wash water" positions and theinstant in which the rinse and wash water reached the spray nozzle. Thistime delay resulted from the necessity for ushing the previously usedHuid from the long conduit before the newly selected fluid reached thespray nozzle.

Also, prior art system had the disadvantage that the water, after warmedin the equipment room, cooled during periods of nonuse and sometimesfroze during cold weather. The resulting pressure increase in thesystem, if instances where each car wash stall had a single conduitfrozen, frequently damaged the system components, especially the pumps.

It is accordingly, the general object of my invention to provideimproved automotive vehicle Wash systems.

Another object of my invention is to provide improved automotive vehiclewash systems in which warm wash and rinse water is essentiallyinstantaneously available at each wash location or stall.

Another object of my invention is to provide means in automobile vehiclewash system to prevent damage to the components of the system,especially the pumps, due to excessive fluid pressurization.

Another object of my invention is to provide an automotive vehicle washsystem which requires fewer pumps in the larger, multi-stallinstallations, enabling the provision of higher quality pumps andrelated components at alower cost.

Another object of my invention is to `provide in an automotive vehiclewash system improved and advantageous control apparatus.

Another object of my invention is to provide improved electric controlarrangements for coin-operated automotive vehicle wash systems.

Another object of my invention is to provide an automotive vehicle washsystem which prevents the washing compound from settling from solutioneven while no vehicles are being washed.

Another object is to provide in an automotive vehicle car wash system othe type having rinse and wash water circulation loops at each car washlocation or stall, an electrical meter control system which utilizesmechanically actuated electrical contacts that are controlled by a timerto establish control over each car wash stall, while preventingelectrical interference between the meters in the various stalls.

These and other objects are effected by my invention as will be apparentfrom the following description taken in accordance with the accompanyingdrawing, forming a part of this application, in which:

FIG. l is schematic plan view of an automatic vehicle car wash systemembodying principles of my invention;

FIG. l-A is a fragmentary, sectional view as seen looking along thelines I-A of FIG. l.

FIG. 2 is a schematic diagram of an electrical control circuit used inthe automotive vehicle Wash system of FIG. l; and

FIG. 3 is a schematic diagram of an electrical circuit used in thecoin-operated meters used in conjunction with the control circuit ofFIG. 2.

Referring now to FIG. l, the numberal 11 designates a wash watercirculation loop and the numeral 13 a rinse water circulation loop.Flexible conduits 15, 17 are positioned along the length of thecirculation loops at selected car wash locations, commonly calledstalls, and communicate with the wash water circulation loop 11 throughwash water check valves 19, 21 and wash water control solenoid valves23, 2S. Also, each exible conduit and spray nozzle 15, 17 communicateswith the rinse water circulation loop 13 through check valves 27, 29 andrinse water control solenoid valves 31, 33. The above cheek valvesprevent interchange of wash water and rinse water between theirrespective loops 11. 13 since there is usually a pressure differentialbetween these loops and only one-way control solenoid valves are nowcommercially available.

The system is arranged so that warm water continually circulates throughloops 11 and 13. For this reason two sets of pumps are used: rinse waterand wash water primary pumps 35, 37 and rinse water and wash watercirculation motor-pumps 121, 123. The primary pumps communicaterespectively via inlet conduits 43, 4S with a rinse water storage tank47 and a wash water storage tank 49. The control system to besubsequently described causes either the primary pump or the circulatingpump of the rinse and wash water circulation loops to be energized sothat uid constantly circulates in both these loops. Notice that thecirculating motor-pumps 121, 123 also communicate with the inletconduits 43, that extend to the storage tanks 47, 49. The primary pumpsare driven in this instance by V-belts 51 and suitable pulleys 53, 55which are rotated preferably by 220 volt electric motors 57, 59. Each ofthe motors has a magnetic starter 61, 63 which is energized by thesubsequently described control circuit means.

From the above it will lbe seen that the fluid in the rinse watercirculation loop 13 may be activated by either the rinse water primarypump 35 or the rinse water circulating pump 121. Similarly, the water inthe wash water circulation loop 11 may be activated by either the washwater primary pump 37 or the wash water circulating motor-pump 12. Onlyone pump in each respective wash water or rinse water circulation loopis energized at any one time, as will be explained in the operationaldescription.

The high capacity and high pressures of the primary pumps of therespective circulation loops are required only when water is to beforced through one or more of the spray nozzles 15, 17 or, in otherwords, when an automotive vehicle is being 'washed or rinsed. If nospray nozzle is being used, however, then only the circulatingmotor-pumps 121, 123 are used since they require less energy andcirculate the uid at a lower pressure.

If Wash water flows through one or more of the wash water controlsolenoid valves 23, 25, wash water primary pump 37 will be automaticallyenergized and wash water circulation motor-pump 123 de-energized. Also,if rinse water flows through one or more of the rinse water controlsolenoid valves 3l, 33, the rinse water primary pump will beautomatically energized and the rinse water circulation pump 121de-energized.

The pressure rating of the primary pumps 35, 37 is commonly 600 p.s.i.When primary pump 35 or 37 is energized, a by-pass solenoid valve 71 or75 is closed to build up the desired pressure in the circulating loop.These solenoid valves are located preferably in the respectivecirculation loops adjacent the inlets of the storage tanks, as shown inPIG. l. The pressures in the circulating loops may exceed 600 p.s.i. andfor this reason pressure relief conduits 65, 67 extend respectivelybetween a pressure relief valve 69 and the rinse water storage tank andbetween the pressure relief valve 73 and the wash water storage tank. Ifthe pressure in the rinse water circulation loop 13, for example,exceeds 600 p.s.i., water will flow through pressure relief conduit 65into the rinse water storage tank 47. Similarly, if the pressure in thewash water circulation loop 11 exceeds 600 p.s.i., fluid will flowthrough pressure relief conduit 67 into the wash 'water storage tank 49.

The above described pressure relief system is especially advantageoussince the pressure in the circulating loops might otherwise tend to varydue to the random movement of the water control solenoid valves 23, 25,31 and 33 between opened and closed positions.

A suitable waterheater 77 having a circulation pump 79 is provided towarm the water in the rinse water storage tank 47, and water softener,normally stored in a softener tank 81, is supplied through a watersoftener timer and metering device 83 into the rinse water storage tank47. A brine tank 85 is provided to mix with and regenerate the softener.

A cleaning compound dispenser 86 is shown in FIG. 1-A connected to anupper portion of the wash 1water storage tank 49, and a water supplyline 88 introduces water to the cleaning compound. The resulting mixtureof wash water is fed into wash water storage tank 49 through suitableports (not shown).

The water supply to the cleaning compound dispenser is controlled by anelectrical sensing element 100, a solenoid valve 102 and a control unit104. The sensing element 100 senses changes in the conductivity of thewash water, which varies according to the concentration of cleaningcompound. Control unit 104 translates the sensed changes in conductivityvia an electrical impulse to the solenoid valve 102, which regulates theflow of water into the cleaning compound dispenser 86. This arrangementprovides accurate control over the amount of cleaning compound in thewash `water and leads to uniform concentration of the cleaning compoundtherein.

Preferably a oat arm 106 and float valve 108 maintaining a selectedwater level in rinse water storage tank 47. Manual control valves 110,112 may be provided in inlet conduits 43, 45 of the primary pumps formaintenance purposes. A check valve 114 located in an upper region of apartition 50 separating the wash and rinse water storage tanks 47, 49permits flow of rinse water into the wash water storage tank, and anoverflow 116 is provided in an upper region of the wash water storagetank.

Referring now to FIG. 2, rinse water primary motor 57 is connected vialeads 87, 89 and 91 to preferably a 220 volt power supply. Each of theprimary motors has respective magnetic starters 61, 63. Also, auxiliarystarting relays 101, `103 are preferably utilized with each motor andcommunicate via leads 105, 107 `with a double pole, single throw controlswitch 109 and via leads 111, 113 with a source of 115 volt power supply115 when the switch 109 is closed.

Another pair of leads 117, 119 communicate between auxiliary startingrelays 101, 103 and the circulation electric motor-pumps 121, 123.

Leads 125, 127 communicate between the auxiliary starting relays 101,103 and by-pass solenoid valves 7l, 75.

Extending from magnetic starters 6l, 63 are leads 131, which communicatewith the coin operated timing meter 129. Also extending from themagnetic starters are leads 137, 139 which communicate via conductor 141with the 115 volt power source.

Extending between power source 115 and meter 129 are a pair of powersource electrical conductors or leads 143, 145. Wash water controlsolenoid valve 23, for example, communicates with lead 145 via aconductor 147, and also, rinse water control solenoid valve 31communicates with conductor 147 and thus lead 145 via conductor 149.Wash and rinse water control solenoid valves 23, 31 communicate withmeter 129 via conductor 151, 153 in addition to connection therewith vialead 145.

Control of the above described electrical and hydraulic circuits ismaintained by persons using stalls in the car wash system by means ofthe coin operated timing meters 129. A control circuit for this meter isillustrated in FIG. 3, which shows portions of the apparatus shown inFIG. 2, including magnetic starters 61, 63, wash solenoids 23, 21; andleads 135, 131, 151 and 153 which communicate with the terminals 155,157, which are referred to as first and second contacts of a firstdouble throw switch and with terminals 159 and 161, which are referredto as first and second contacts of a second double throw switch,Alternatively, such terminals are contact points of a double pole,double throw switch 162, which is commonly a toggle switch located on acontrol panel (not shown) in each car wash stall. Contacts 155, 157, 159and 161 are sometimes hereinafter referred to as first, second, thirdand fourth contacts of a switch means 162, which may have a variety offorms. Switch arms 163, are connected with terminals 167, 169, are freeto move into contact with terminals 155, 159 or terminals 167, 161.

Terminals 167, 169 communicate with a pair of fixed contact points 171,173 via conductors 175, 177.

Another set of contact points 17 8, 179 are movable into and away fromengagement 'with fixed contact points 171, `173 by a cam 181 controlledby a timer 183 driven by a timer motor as indicated by the phantom line186. Movable contacts 178, 179 have terminals 187, 189 which communicatevia conductors 191, 193 with conductor 143 and thus with the 115 voltpower source. Timer motor `18S communicates via conductor 195 withconductor 177 and thus with contact point 173 and via conductor 197'with lead 143 and consequently, also with the 115 volt A.C. powersource.

The tixed and movable contact points 171, 173 and 178, 179 may bereferred to as a first set of contacts 171, `178 and a second set ofcontacts 173, 179 and may be actuated upon insertion of a coin into theassociated meter. After coil insertion, mechanical movement of a controlknob may be used to urge the contacts together. Alternatively, thesecontacts may be controlled by electrical relays; my invention is notlimited to any particular form of contact movement means. When thecontacts close, the timer motor is energized to rotate cam 181, givingthe user of the car wash stall a measured period of time in which toselectively spray wash water or rinse water on his vehicle by movementof the toggle switch 162. Portions of the energizing circuits for thecommon primary wash motor and primary rinse motor are connected inparallel as indicated by the conductors 199, 201.

OPERATION DESCRIPTION In operation, a coin is dropped in the coin slot(not shown) in the meter 129 of one of the car wash stalls, causingmovable contact points 178, 179 of the double pole single through switchto engage lixed contacts 171, 173. With the control arms 163, 165 of themeter toggle switch in the center position, the control circuit is open,and no current liows to the wash pump or rinse pump magnetic starts 61,63 or to the wash or rinse Water control solenoid valves 23, 25, 31, 33.

When no car is being washed or rinsed, electric energy tiows throughconductors 105, 107, auxiliary contacts 101, 103; conductors 117, 119 tothe rinse and circulation pumps 121, 123, returning to the power source115 through conductors 122, 124. Similarly, electric energy tiowsthrough conductors 105, 107, auxiliary contacts 101, 103; conductors125, 127 to the solenoids 71, 75; through conductors 126, 128 andconductors 122, 124 to the 115 volt power source 115. Consequently, therinse and wash water circulation pumps 121, 123 are energized and fluidflows through the wash water circulation loop 11 and the rinse watercirculation loop 13. Energization of solenoids 71, 75 opens theassociated by-pass valves to reduce the pressure in the circulationloops.

Since the rinse water in the storage tank 47 is heated in water heater77 and circulated through the rinse water storage tank 47 by circulationpump 79, the water liowing through the rinse water circulation loop 13is constantly warmed, thereby preventing freezing during cold weatherand enabling more effective car wash. The wash water storage tank 49 andthe rinse water storage tank are separated by a partition 50 which is ofrelatively thin, heat conducted material such as stainless steel orgalvanized steel, and consequently, the wash water in storage tank 39 iswarmed by the transfer of heat therethrough. Hence, the water in thewash water circulation loop 11 is constantly warmed to prevent freezingduring cold weather even when none of the spray nozzles 15, 17 are inuse.

If the toggle switch 162 is moved to a position such that arms 163, 165engage terminals 155, 159, then electric energy may flow betweenconductors 143, 145 (see FIG. 3), via conductors 193, 191; fixed andmovable contact points 17S, 179 and 171, 173; conductors 175, 177; arms163, 165; conductors 135, 151; wash pump starter 61 and wash watercontrol solenoid valve 23; and conductors 139, 147, hence closing anelectrical circuit with the 115 volt power source. This starts the washpump primary motor 59, closes solenoid valve 75, pressurizes the tiuidin the wash water circulation loop 1l, opens the wash water controlsolenoid valve 31, and enables the discharge of a high pressure streamof wash water on the automobile.

As previously stated, wash water primary pump 37 may be capable ofputting up 600 lbs. or more of pressure, and to prevent excessivepressurization of the Huid in the wash water circulation loop 11,by-pass valve 73 is designed to open at above 600 p.s.i. pressure toenable wash water to ow through by-pass conduit 67 and into the washwater storage tank 49. As previously explained, the same by-pass systemis installed in the rinse water circulation loop to prevent excessivepressurization of fluids therein.

When the operator of the toggle switch 162 decides to rinse the washwater from his vehicle, he moves the toggle switch to a position suchthat the arms 163, 165 move downward as viewed in FIG. 3 to engage theterminals 157, 161. This closes a circuit between the rinse waterprimary pump starter 63 and 115 volt power source and simultaneously,closes another circuit between the rinse water control solenoid valve 31and the 115 volt source via conductors 143, conductors 193, 191; movableand xed contacts 178, 179 and 171, 173; conductors 175, 177; througharms 163, 167 of switch 162; conductors 131, 153; and conductors 137,149. Also, this opens the above described circuits between the wash pumpstarter 61, stopping the Wash pump primary motor 37 while closing thewash water control valve solenoid 23. The auxiliary relay 103 isactuated to start the wash water circulation motor pump 123 and opensolenoid valve 75. With the toggle in the downward position, rinse waterprimary motor 35 is started since the magnetic starter 61 has beenenergized by closing its associated circuit, and auxiliary contact 101stops the rinse water circulation motor pump 121 and closes the solenoidvalve 71. Thus, rinse water primary pump 35 is energized and the uid inthe rinse Water circulation loop circulated at a pressure of 600 lbs.Simultaneously, the rinse water control valve solenoid 31 is energizedsince its circuit with the 115 volt power source is closed and rinsewater immediately flows through the associated spray nozzle.

It should be apparent from the foregoing description that I haveprovided an invention having significant advantages. The use of therinse water and the wash water circulation loops in which warm water iscontinuously circulated irrespective of whether or not a spray nozzle isbeing used, prevents the fluid in the system from freezing during coldweather, provides better washes, and in addition, enables almostinstantaneous change from rinse water to wash water and back again uponmovement of the associated toggle switch 162. The constant circulationof wash water prevents the settlement of cleaning compound from the washwater.

The use of centrally located circulation pumps and circulation loopsdecreases the number of components required as compared to prior artsystems in which at least one pump was required for each individual washlocation. As a consequence, I can provide higher quality equipment moreeconomically to signicantly reduce maintenance problems.

Moreover, the use of a by-pass system in each circulation loop whichenables pressure over a selected level to activate a by-pass valve toreturn a circulating fluid to its storage tank prevents excessive anddamaging pressure build-up in the system.

The construction of the wash water and rinse water storage tanks in amanner such that they are separated by a heat transferring partition andthe constant circulation of water enables the wash water to beautomatically heated by using a conventional Water heater to heatinitially only the rinse water in its storage tank.

The use of the electrical control circuit as shown in FIG. 3accomplishes interconnection in said system to establish control of theprimary pumps 35, 37 from any car wash location or stall coin operatedmeter 129; at the same time, control of any wash or rinse water controlvalve 23, 31 from any source other than the particular coin operatedmeter associated With the respective wash or rinse water control valveis precluded.

I previously utilized timers in which the rst set 178, 171 and secondset 179, 173 of contacts were controlled by electrical relays but afterexperiencing significant difficulty with such an arrangement,successfully adopted the use of the cam 181 driven by the timer 183 tocontrol the contacts. The cam r mechanically controlled system operateswith significant reliability.

While I have shown my invention in only one of its forms, it should beapparent to those skilled in the art that it is not so limited, but issusceptible to various changes and modification without departing fromthe spirit thereof.

I claim:

1. In an automotive vehicle wash system having rinse and wash watercirculation loops at each car wash location or stall, spray nozzles ineach loop at each location for discharging water on a vehicle, rinse andwash solenoid operated control valves separately connected with saidloops for selectively discharging wash or rinse water through eachnozzle, a wash water primary pump and energization means, and a rinsewater primary pump and energization means, the improvement comprising:

a coin operated meter for each said car wash location;

each said meter having a first set of contacts, a second set ofcontacts, a first single pole double throw switch means, and a secondsingle pole double throw switch means;

each said meter having timer means and mechanical means for closing saidfirst and second contact sets simultaneously [and starting said timermeans] upon acceptance by said meter of a coin, [and] said mechunicalmeans being responsive to said timer for simultaneously opening said rstand second contact sets at the end of a timed interval;

power source leads;

means for connecting said first set of contacts serially with a firstcontact of said first double throw switch and said wash water primarypump electric motor energizing means and said power source leads, andmeans also for connecting said first set of contacts serially with asecond contact of said first double throw switch and said rinse waterprimary pump electric motor energizing means and said power sourceleads;

means for connecting said second set of contacts serially with a firstcontact of said second double throw switch and said wash water controlvalve solenoid and said power source lead, and means also for connectingsaid second set of contacts serially with a second contact of saidsecond double throw switch and said rinse Water control valve solenoidand said power source leads;

means connecting said first Contact of said first double throw switchwith the same contact in each meter at each car wash location, and meansconnecting said second contact of said first double throw switch withthe same contact in each meter at each car wash location;

whereby electrical interconnection in said system allows control of saidprimary pumps from any of said car wash location coin operated meters,but control of any wash or rinse water control valve from any sourceother than the particular coin operated meter associated with saidrespective wash or rinse water control valve is precluded.

2. ln an automotive vehicle wash system having rinse and wash watercirculation loops at each car wash location or stall, spray nozzles ineach loop at each location or stall, spray nozzles in each loop at eachlocation for discharging water on a vehicle, rinse and wash solenoidoperated control valves separately connected with said loops forselectively discharging wash or rinse water through each nozzle, a washwater primary pump and energization means, and a rinse water primarypump and energization means, the improvement comprising:

a coin operated meter for each said car wash location;

each said meter having a first set of contacts, a second set ofcontacts, and a double pole double throw switch means;

each said meter having timer means and mechanical means for closing saidfirst and second contact sets simultaneously [and starting said timermeans] upon acceptance by said meter of a coin, [and] said mechanicalmeans being responsive to said timer for simultaneously opening saidfirst and second contact sets at the end of a timed interval',

power source leads;

means for connecting said rst set of contacts serially with a firstcontact of said double throw switch means and said wash water primarypump electric motor energizing means and said power source leads, andmeans also for connecting said first set of contacts serially with asecond contact of said double throw switch means and said rinse waterprimary pump electric motor energizing means and said power sourceleads;

means for connecting said second set of contacts serially with a thirdcontact of said double throw switch means and said wash water controlvalve solenoid and said power source leads, and means also forconnecting said second set of contacts serially with a fourth contact ofsaid double throw switch means and said rinse water control valvesolenoid and said power source leads;

means separately connecting said first and second contacts of saiddouble throw switch means with the same contact in each meter at eachcar wash location;

whereby electrical interconnection in said system allows control of saidprimary pumps from any of said car wash location coin operated meters,but control of any wash or rinse water control valve from any sourceother than the particular coin operated meter associated with saidrespective wash or rinse water control valve is precluded.

3. In an automotive vehicle wash system having rinse and wash watercirculation loops at each car Wash location or stall, spray nozzles ineach loop at each location for discharging water on a vehicle, rinse andwash solenoid operated control valves separately connected with saidloops for selectively discharging wash or rinse water through eachnozzle, a wash water primary pump and energization means, and a rinsewater primary pump and energization means, the improvement comprising:

a coin operated meter for each said car wash location;

each said meter having a first set of contacts, a second set ofcontacts, and switch means connected in series with said sets ofcontacts;

each said meter having timer means and mechanical means for closing saidfirst and second Contact sets simultaneously [and starting said timermeans] upon acceptance by said meter of a coin, [and] said mechanicalmeans being responsive to said timer for simultaneously opening saidfirst and second contact sets at the end of a timer interval;

power source leads;

means for connecting said first set of contacts serially with a firstcontact of said switch means and said wash water primary pump electricmotor energizing means and said power source leads, and means also forconnecting said first set of contacts serially with a second contact ofsaid switch means and said rinse water primary pump electric motorenergizing means and said power source leads;

means for connecting said second set of contacts serially with a thirdcontact of said switch means and said wash water control valve solenoidand said power source leads, and means also for connecting said secondset of `contacts serially with a fourth contact of said switch means andsaid rinse water control valve solenoid and said power source leads;

means separately connecting said first and second contacts of saidswit-ch means with the same contact in each meter at each car washlocation;

whereby electrical interconnection in said system allows control of saidprimary pumps from any of said car wash location coin operated meters,but control of any wash or rinse water control valve from arly sourceother than the particular coin operated meter associated with saidrespective wash or rinse water control valve is precluded.

4. The system defined by claim I, 2 or 3 in. which said mechanical meanscomprises a cam actuated by said timer and in operative connection withsaid )rst and second sets of contacts.

References Cited patent.

UNITED STATES PATENTS 6/1956 Roberts 3/1965 Baird, Jr. et al.

9/1965 Durrant OTHER REFERENCES National Pride Car Wash, brochure, Mar.13, 1965.

STANLEY H. TOLLBERG, Primary Examiner U.S. Cl. X.R.

